Data Link Layer

The Data-link layer defines the protocols that control the Physical layer. Issues such as how the medium is accessed and shared, how devices or stations on the medium are addressed, and how data is framed prior to transmission on the medium are defined here. Common examples of Data-link layer protocols are Ethernet, Token Ring, Fiber Distributed Data Interface (FDDI), and Point-to-Point Protocol (PPP).

Datalink layer is after physical layer so it is second layer in the OSI Model. Like network layer is responsible for providing IP address or logical address to the signal, data link layer is responsible for providing physical address to the devices. Physical address can also be termed as hardware addresses, these addresses is very important when the signal flow over the network, that is from one device to another using some medium.. These addresses assign to signal by data-link layer or the logical addresses are also known as Media Access Control or simply MAC addresses.

The responsibilities of data link layer also include the way how a networking device accesses the media which is the common way between source and destination. This type of communication is oly for the devices communication is only for devices which are on same data link layer media type.

The another responsible of which data link layer is also concern for accepting bits (from the physical layer converting them into frames which are then delivered to network layer for further processing. The error control facility of data link layer discard bad frames and transfer only good quality frame, which helps in good transmission of signal.

Though the error control facility is includes in this layer but the Error control in TCP/IPs model OSI reference model is different however.

Examples Of Data Link Layer Protocols

ANSIs FDDI.

IEEEs 802.2

802.5

Ethernet II

802.3

Examples of WAN connections

ATM,

HDLC

network interface controllers

SLIP

Frame Relay,

PPP

SDLC

X.25. Bridges,

switches,

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